Thanks a lot Tony.

I will see what else I can find on the subject and post it.

CF

Tony Thomas wrote:
Only formula I am aware of is the speed formula.

rpm x pitch
------------------ = theoritical speed x efficiency = actual speed
1056 x gear ratio

1056 is a conversion factor to get from inches of pitch and rev per minute
into miles per hour.

gear ratio will be 1.5 or 1.86 or 2.0 depending on your motor usually.